Autor según el artículo: Silvia De la Flor; Alberto Belmonte; Xavier Fernández-Francos; Àngels Serra

Departamento: Química Analítica i Química Orgànica Enginyeria Mecànica

Autor/es de la URV: DE LA FLOR LOPEZ, SILVIA; Alberto Belmonte; Xavier Fernández-Francos; Àngels Serra

Palabras clave: Dual-curing Rheological analysis Thiol-epoxy

Resumen: An extensive characterization of a sequential dual-curing system based on off-stoichiometric “thiol-epoxy” mixtures was carried out using thiol compounds of different functionality. The intermediate and final materials obtained after each curing stages at different thiol-epoxy ratios were studied by means of thermomechanical and rheological experiments. The storage and loss modulus and the loss factor tan δ were monitored during the curing process to analyse gelation and network structure build-up. The critical ratio for gelation was determined making use of the ideal Flory-Stockmayer theory and compared with experimental results. Intermediate materials obtained in the vicinity of the theoretical critical ratio did not have the mechanical consistency expected for partially crosslinked materials, did not retain their shape and even experienced undesired flow upon heating to activate the second curing reaction. The rheological results showed that the critical ratio is higher than the predicted value and that a softening during the second curing stage affects the shape-retention at this ratio. From the thermomechanical results, a wide range of intermediate and final materials with different properties and applicability can be obtained by properly choosing the thiol-epoxy ratio: from liquid-like to highly deformable intermediate materials and from moderately crosslinked (deformable) to highly crosslinked (brittle) final materials.

Grupo de investigación: Grup d'Investigació en Enginyeria Computacional i Experimental

Áreas temáticas: Enginyeria mecànica Ingeniería mecánica Mechanical engineering

Acceso a la licencia de uso: https://creativecommons.org/licenses/by/3.0/es/

ISSN: 0261-3069

Identificador del autor: 0000-0002-6851-1371; n/a; 0000-0002-3492-2922; 0000-0003-1387-0358

Fecha de alta del registro: 2016-11-02

Página final: 127

Volumen de revista: 113

Versión del articulo depositado: info:eu-repo/semantics/acceptedVersion

Enlace a la fuente original: https://www.sciencedirect.com/science/article/abs/pii/S0264127516313004?via%3Dihub

DOI del artículo: 10.1016/j.matdes.2016.10.009

Entidad: Universitat Rovira i Virgili

Año de publicación de la revista: 2017

Página inicial: 116

Tipo de publicación: Article Artículo Article